ok I've asked this before sorry for the lack of details.I have a 2000 Honda cr 125. I just re-did the top end and put new fluids in it and cleaned the carborator. all the right fluids. but there is a lot of smoke that comes out when I start and rev it.The smoke is gray so I don't think it is as bad as it could be. I've fixed it myself so could it be bad enginering, but I don't think that is the problem. What's wrong and how do I fix it. And please only answer if you really know.
2006-09-09 11:51:43 · 14 answers · asked by smoky 2 in Cars & Transportation ➔ Motorcycles
would changing the piston rings be something a 17 year old could do?
2006-09-09 12:06:56 · update #1
well you say the smoke is grey...if you mean white(coolant) and not blue(oil).... you could be burning coolant in which case you should check your radiator to see if the level has gone down any, and also feel if the radiators get unusually hot. You may have fudged on the head gasket and this could be letting coolant into the cylinder.
2006-09-09 19:59:13 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Ah....Guys...It's a two-stroke. It's supposed to smoke. So far Guardrailjim has the only good advice here. I just want to add.
If you had previously left the fuel valve on for a long time the lower end may be filled with a lot of oil. Which will eventually clear up, albeit after possibly fouling a few plugs. Also make sure you're mixing your fuel at the right ratio. If you were running too rich a mix before then it's quite possible that you again have a lot of oil in the lower end, or the exhaust which will also clear up with riding. I imagine that it's also possible you spilled a fair amount of oil into the lower end when you did the top end, which isn't horrible. If the bike idles fine revs up quick and has good power then I'd say just ride it. Just pay attention to your gearbox oil level as jim said. Although bikes that have a bad crank case gasket tend not to run very well if at all. If it is sucking oil out of the gearbox then as soon as it drains the gearbox completely it'll suck a lot more air and really run bad.
Changing the piston rings is easy. You just have to be careful that's all. The rings are hardened a lot and are very brittle. They also have an up and a down which is easy to see on two stroke rings. Just note the notch in both sides of the ring where it is split and see how the fit to the pin that is in the ring channel on the piston which prevents the ring from turning.
2006-09-09 17:17:06 · answer #2 · answered by Ron Allen 3 · 0⤊ 0⤋
Get it checked by a garage mechanic. Blue smoke is not good. It may indicate worn piston rings. That would have to be replaced. Black smoke usually indicates that the gasoline -air mixture is too rich. (i.e. too much gas or not enough ar. White smoke, ( a little ), on a cold day is usually water vapor. If there is a lot of smoke it , whatever the color, indicates pontial trouble. Do not wait, a small problem can grow into a major problem later on.
Doc. Dan.
2006-09-09 11:57:01 · answer #3 · answered by Dan S 6 · 1⤊ 1⤋
-Always give year, make, engine size and model # when asking questions. 2 & 4 stroke engines can have similar symtoms needing different repairs. -I'll answer as if your bike is a 4 stroke. -If you just re-did the top end, then it's possible that the ring end gaps have lined up (the end gaps should be staggered to prevent oil from getting by and burning along with the fuel). -The oil rings are so thin, they're easy to snag and bend. -If you determine that the smoke is from oil burning, then you should re-do the top end. -As long as the top end is apart, change the valve guide seals.
2016-03-27 04:26:16 · answer #4 · answered by ? 4 · 0⤊ 0⤋
-A 14 year old can change the rings with the right teacher showing him/her.
-You just re-built the top end. If you made any mistakes, I doubt if the bike would run.
-The right side crank seal is probably leaking.
-Oil is getting sucked into the crankcase from the transmission.
-It's a common problem on 2 strokes.
-I've changed the crank seals twice on my cr250.
-To change the seal, you have to remove clutch cover, clutch and primary gear.
-If you're mechanically inclined enough to rebuild the top end, then this is a breeze.
2006-09-09 12:57:56 · answer #5 · answered by guardrailjim 7 · 1⤊ 0⤋
2 Stoke motorcycles do smoke a lot when they are first started, when they warm up they should smoke less as all the engine internals expand a little when they get hot.
As mentioned above a Crank seal could have gone also
2006-09-09 21:56:16 · answer #6 · answered by by eck lass 2 · 0⤊ 0⤋
every two stroke motor smokes at first starting there is a coating of oil in the exhaust pipe ,on top of the piston ect get it hot go riding
2006-09-11 01:16:28 · answer #7 · answered by Anonymous · 0⤊ 0⤋
you should lean your fuel oil mix a little. I mix my cr250 100 milileters to gallon (50:1) and my bike runs awesome. Also it may still have assembly oil on your top end.
2006-09-09 17:56:12 · answer #8 · answered by George J 2 · 1⤊ 0⤋
well if you just had the carburator cleaned and put in new fluids the bike is just getting ajusted to the fluids give it a while it will go away
2006-09-12 11:26:59 · answer #9 · answered by franckie c 1 · 0⤊ 1⤋
If a lot of smoke comes out i advise u to take it somewhere they can fix it or check it?
2006-09-09 11:56:30 · answer #10 · answered by Lil J 1 · 0⤊ 1⤋